Bài tập 1.44 trang 40 SBT Toán 11

A. 3.     

B. 4

C. 5   

D. 6

A. \(\left[ \begin{array}{l}x = \dfrac{\pi }{3} + k\pi \\x = \dfrac{\pi }{6} + k\pi \end{array} \right.\,\,\left( {k \in Z} \right)\)

B. \(\left[ \begin{array}{l}x = \dfrac{\pi }{3} + k2\pi \\x = \dfrac{\pi }{6} + k2\pi \end{array} \right.\,\,\left( {k \in Z} \right)\)

C. \(\left[ \begin{array}{l}x =  - \dfrac{\pi }{3} + k\pi \\x =  - \dfrac{\pi }{6} + k\pi \end{array} \right.\,\,\left( {k \in Z} \right)\)

D. \(\left[ \begin{array}{l}x =  - \dfrac{\pi }{3} + k2\pi \\x = \dfrac{\pi }{6} + k\pi \end{array} \right.\,\,\left( {k \in Z} \right)\)

A. \(\dfrac{{ - 9}}{8} \le m \le 2\)

B. \(\dfrac{{ - 9}}{8} \le m \le 1\)

C. \(m \ge \dfrac{{ - 9}}{8}\)

D. \(\dfrac{{ - 5}}{8} \le m \le 2\)

A. 15    

B. 2

C. 3    

D. 1

A. 15 

B. -15

C. 14    

D. -14

A.3  

B.5

C.4   

D.6

A. \(x = \dfrac{{ - \pi }}{4} + k2\pi ;x = \arctan \dfrac{{10}}{3} + k2\pi ;k \in \mathbb{Z}\)

B. \(x = \dfrac{{ - \pi }}{4} + k\pi ;x = \arctan \dfrac{7}{2} + k2\pi ;k \in \mathbb{Z}\)

C.\(x = \dfrac{{ - \pi }}{4} + k\pi ;x = \arctan \dfrac{{10}}{3} + k\pi ;k \in \mathbb{Z}\)

D. \(x = \dfrac{{ - \pi }}{4} + k2\pi ;x = \arctan \dfrac{{10}}{3} + k\pi ;k \in \mathbb{Z}\)

A. \(2\)            

B.\( - \dfrac{1}{3}\)

C. \(\dfrac{{ - 1}}{2}\)           

D. 1

A. 0            

B. \(2\pi \)

C. \(4\pi \)      

D. \(6\pi \)